JP6427765B2 - Common mode noise filter - Google Patents

Description

  The present invention relates to a small and thin common mode noise filter used in various electronic devices such as digital devices, AV devices, and information communication terminals.

  This type of conventional common mode noise filter has a configuration as shown in FIG.

  FIG. 4 is an exploded perspective view showing a conventional common mode noise filter. As shown in FIG. 4, the conventional common mode noise filter is formed by laminating a plurality of insulator layers 1 and a plurality of coil conductors 2, and conductors 3a to 3d and conductors 4a to 4d constituting the coil conductor 2. The conductors 5a to 5d are electrically connected to each other to form three independent spiral first to third coils 3 to 5, and the three first to third coils 3 to 5 are formed. Were arranged in the stacking direction in order from the bottom.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP-A-11-186056

  However, since the above-described conventional common mode noise filter has the second coil 4 disposed between the first coil 3 and the third coil 5, the first coil 3 and the third coil 5 Thus, since the first coil 3 and the third coil 5 are hardly magnetically coupled, the impedance of the common mode component cannot be increased, and as a result, the common mode noise removal characteristic is low. It had the problem that.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a common mode noise filter capable of improving the common mode noise removal characteristics.

In order to solve the above problems, the present invention provides a laminate in which a plurality of insulator layers are laminated, three coil conductors provided in the laminate, and the coil conductor provided in the laminate. is provided with an external electrode, provided on one or more turns in each of the three of the coil conductor spiral, rectangular shape outer shape of the surface perpendicular to the winding axis is comprised of long and short sides of the same dimensions Further, when the ratio of the length of the long side to the short side is X, 2.0 <X ≦ 2.5. In the three coil conductors, the long sides of the two coil conductors are opposed to each other, and the short sides of the two coil conductors are opposed to the long sides of the other coil conductors. is there.

  In the common mode noise filter of the present invention, the three coil conductors are each spirally provided in one or more turns, and the outer shape of the surface orthogonal to the winding axis is formed in a rectangular shape having long and short sides. In addition, provided on one insulator layer, the long sides of the two coil conductors of the three coil conductors are opposed to each other, and the short sides of the two coil conductors and the long sides of the other coil conductors Since the two conductors are arranged opposite to each other, three conductors are provided on the same surface, whereby the distance between the coil conductors can be shortened, and the long side and the short side of the outer shape of each coil conductor can be reduced. Since the sides face each other, the conductors can be adjacent to each other, and the magnetic coupling can be improved between all the conductors.

  As a result, since the impedance of the common mode component can be increased, there is an excellent effect that the common mode noise removal characteristics can be improved.

The disassembled perspective view of the common mode noise filter in one embodiment of this invention Perspective view of the common mode noise filter The disassembled perspective view of another common mode noise filter in one embodiment of the present invention Exploded perspective view showing the structure of a conventional common mode noise filter

  Hereinafter, a common mode noise filter according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a common mode noise filter according to an embodiment of the present invention, and FIG. 2 is a perspective view of the common mode noise filter.

  The common mode noise filter of the present invention includes a laminated body 11 in which a plurality of insulator layers 12 are laminated, and first, second, and third coils provided inside the laminated body 11 as shown in FIGS. Three coil conductors of conductors 13, 14, and 15, and an external electrode provided in the laminate 11 and connected to each coil conductor are provided.

The laminated body 11 includes a plurality of insulator layers of first to eighth insulator layers 12a to 12h that are formed into a sheet shape by an insulating material such as ferrite or glass ceramic based on Fe ₂ O _3. 12 is laminated.

  Of the laminate 11, the first and second insulator layers 12a and 12b and the seventh and eighth insulator layers 12g and 12h are dummy layers for adjusting the dimensions of the laminate 11.

  The number of dummy layers is not particularly limited in the present embodiment, and the number of dummy layers can be appropriately adjusted according to the dimensions of the stacked body 11.

  The third insulator layer to the fifth insulator layers 12c to 12e are provided with three coil conductors of first, second, and third coil conductors 13, 14, and 15.

  The sixth insulator layer 12f is a protective layer for protecting the three coil conductors.

  Further, the three coil conductors of the first, second, and third coil conductors 13, 14, and 15 are configured by connecting divided coil conductors that are divided into two.

  The first coil conductor 13 is configured by connecting two first divided coil conductors 13a and 13b, and the second coil conductor 14 is configured by connecting two second divided coil conductors 14a and 14b, The third coil conductor 15 is configured by connecting two third divided coil conductors 15a and 15b.

  Each of these divided coil conductors is formed by plating or printing a conductive material such as silver on the insulating layer 12, and each of the divided coil conductors is provided in one or more turns in a spiral shape and is orthogonal to the winding axis. The outer shape of the surface is formed in a rectangular shape having long sides and short sides.

  Here, the rectangular shape whose outer shape is composed of a long side and a short side means a shape surrounded by a straight line along the long side and the short side of the outermost periphery, and the corner between the long side and the short side. A rounded portion or a chamfered taper may be provided.

  The first, second, and third divided coil conductors 13a, 14a, and 15a are provided on the same surface on one insulator layer 12, and the first, second, and third divided coil conductors 13b, 14b, and 15b are provided. Another insulating layer 12 is provided on the same surface.

  In the present embodiment, the first, second, and third divided coil conductors 13a, 14a, and 15a are provided on the third insulator layer 12c, and the first, second, and third divided coil conductors 13b, 14b, and 15b are connected to the first. The five insulator layers 12e are provided.

  On the other hand, regarding the arrangement in which the first, second, and third divided coil conductors 13a, 14a, and 15a are provided on the third insulator layer 12c, first, of the three divided coil conductors, The outermost long sides are adjacent to each other so as not to be short-circuited, and are opposed so that the long sides are parallel to each other.

  Then, the outermost short side of each of the two divided coil conductors and the outermost long side of the other remaining divided coil conductors are adjacent to each other so as not to be short-circuited, and the short side and the long side are parallel to each other. The divided coil conductors are arranged to face each other.

  In the present embodiment, as shown in FIG. 1, the outermost long sides of the first divided coil conductor 13a and the second divided coil conductor 14a are opposed to each other, and the first divided coil conductor 13a and the second divided coil conductor 14a Each short side and the outermost long side of the third divided coil conductor 15a are arranged to face each other.

  In this way, since three divided coil conductors are provided on the same surface, the distance between the divided coil conductors can be shortened, and the long side and the short side of the outer shape of each divided coil conductor are short-circuited. Therefore, the divided coil conductors can be adjacent to each other, and the magnetic coupling can be improved between all the divided coil conductors.

  At this time, the length of the long side of the first divided coil conductor 13a and the long side of the second divided coil conductor 14a with the long sides opposed to each other is preferably set to the same length. The coil conductor 13a and the second divided coil conductor 14a are preferable because the magnetic coupling can be improved efficiently.

  Further, the total length of the short sides of the first divided coil conductor 13a and the second divided coil conductor 14a having the long sides opposed to each other is set to the same length as the long side of the third divided coil conductor 15a. In this way, it is possible to efficiently magnetize between the third divided coil conductor 15a and the first divided coil conductor 13a and between the third divided coil conductor 15a and the second divided coil conductor 14a. Can be combined.

  The short side of the first divided coil conductor 13a and the short side of the second divided coil conductor 14a are preferably set to the same length, and in this way, the first divided coil conductor 15a and the first divided coil conductor 15a are connected to the first divided coil conductor 15a. It is possible to balance the strength of magnetic coupling between the divided coil conductor 13a and between the third divided coil conductor 15a and the second divided coil conductor 14a.

  That is, it is preferable that the outer shapes of the first, second, and third divided coil conductors 13a, 14a, and 15a are rectangular with the same dimensions.

  In this case, when the ratio of the long side length to the rectangular short side is X, where the ratio of the long side to the short side of the rectangular shape is X or less, the ratio of the first divided coil conductor 13a A portion of the short side of the first and second divided coil conductors 13a and 14a that does not face the long side of the third divided coil conductor 15a due to the distance between the long side and the long side of the second divided coil conductor 14a This is not preferable because the magnetic coupling deteriorates.

  Further, if X is larger than 2.5, the portion that does not face the short sides of the first and second divided coil conductors 13a and 14a increases on the long side of the third divided coil conductor 15a, and the magnetic coupling deteriorates, which is not preferable. .

  Therefore, it is preferable to satisfy 2.0 <X ≦ 2.5 because the magnetic coupling can be improved efficiently.

  Further, the shorter side of each of the first and second divided coil conductors 13a, 14a and the second side than the distance between the long side of the first divided coil conductor 13a and the long side of the second divided coil conductor 14a opposed to each other. It is preferable to reduce the distance from the long side of the three-divided coil conductor 15a.

  This is because the magnetic coupling on the short side is weaker than that on the long side. By doing so, the magnetic coupling on the short side is strengthened and the balance of the magnetic coupling of each divided coil conductor is improved. It is something that can be done.

  From these results, the magnetic coupling of the first, second, and third divided coil conductors 13a, 14a, and 15a can be improved on one third insulator layer 12c, and the magnetic force between the divided coil conductors can be improved. It can improve the balance of bonding.

  Similarly, regarding the arrangement in which the first, second, and third divided coil conductors 13b, 14b, and 15b are provided on the same surface on the other fifth insulator layer 12e, two of the three divided coil conductors are similarly provided. The longest outermost sides of the split coil conductors are opposed to each other.

  Then, the outermost short side of each of the two divided coil conductors is opposed to the outermost long side of the other divided coil conductor.

  Further, on the fifth insulator layer 12e, each split coil conductor is connected to the third insulator layer 12c so that the connected split coil conductors do not overlap each other when viewed from the stacking direction of the insulator layer 12. Are arranged in different positions.

  In the present embodiment, as shown in FIG. 1, first, the first split coil conductor 13a on the third insulator layer 12c when viewed from the lamination direction of the insulator layer 12 (the vertical direction in FIG. 1). On the fifth insulator layer 12e, the second divided coil conductor 14b is disposed at the position where has been disposed. And the long side of the outermost periphery of the 2nd division | segmentation coil conductor 14b and the 3rd division | segmentation coil conductor 15a is made to oppose, each short side of these 2nd division | segmentation coil conductor 14b and the 3rd division | segmentation coil conductor 15b, and the 3rd division | segmentation coil conductor It is arranged so that the longest outermost side of 15b faces.

  By doing in this way, like the 1st, 2nd, and 3rd division coil conductors 13a, 14a, and 15a formed on the 3rd insulator layer 12c mentioned above, on one 5th insulator layer 12e, The magnetic coupling of the first, second, and third divided coil conductors 13b, 14b, and 15b can be improved, and the balance of the magnetic coupling between the divided coil conductors can be improved.

  Furthermore, the third insulator layer 12c is arranged in a different position from the third insulator layer 12c so that the connected split coil conductors do not overlap each other when viewed from the stacking direction of the insulator layer 12. In the above, the first split coil conductor 13a and the second split coil conductor 14a have their long sides facing each other and the magnetic coupling is strong. However, on the fifth insulator layer 12e, the second split coil conductor 14b is different. And the third divided coil conductor 15b can be made to face each other with their long sides facing each other to enhance magnetic coupling.

  Further, in the stacking direction of the insulator layer 12, the first split coil conductor 13a and the second split coil conductor 14b are stacked, the second split coil conductor 14a and the third split coil conductor 15b are stacked, and the third split coil conductor. 15a and the 1st division | segmentation coil conductor 13b are laminated | stacked, and the division | segmentation coil conductors which are mutually different in the lamination direction can be magnetically coupled.

  From these results, when each divided coil conductor is connected, the magnetic coupling of the first, second, and third coil conductors 13, 14, and 15 can be further improved, and the balance of the magnetic coupling can be improved. What can be better.

  Further, the first, second and third coil conductors 13a, 13b, 14a, 14b, 15a and 15b have substantially the same area in top view, and the first, second and third coil conductors 13, 14, It is preferable to make the impedances of the 15 common mode components substantially equal, or to make the magnetic couplings of the first, second, and third coil conductors 13, 14, and 15 the same. Further, the center portion of the first, second, and third divided coil conductors 13a, 14a, and 15a on the third insulator layer 12c in the top view is positioned at the apex portion of the equilateral triangle, and the fifth insulator layer 12e If the central portion of the first, second, and third divided coil conductors 13b, 14b, and 15b in the top view is positioned at the apex portion of the equilateral triangle, it becomes easier to make the magnetic couplings the same.

  Moreover, the structure which connects each division | segmentation coil conductor in this way is comprised by the some connection via 19, and the 1st, 2nd, 3rd coil connection conductors 20, 21, and 22 which connect each division | segmentation coil conductor. .

  The connection via 19 is provided in the fourth and fifth insulator layers 12d and 12e, and a hole is formed in each insulator layer and filled with a conductive material such as silver. In the fourth insulator layer 12d, The first, second, and third divided coil conductors 13b are provided in accordance with the positions of the inner peripheral ends of the first, second, and third divided coil conductors 13a, 14a, and 15a. , 14b and 15b are provided in accordance with the positions of the inner peripheral ends.

  The first, second, and third coil connection conductors 20, 21, and 22 are formed by plating or printing a conductive material such as silver on the fourth insulator layer 12d.

  And the 1st coil conductor 13 is comprised by connecting between the inner peripheral ends of the 1st division | segmentation coil conductors 13a and 13b with the connection via 19 and the 1st coil connection conductor 20. FIG. The second and third coil conductors 14 and 15 are similarly configured.

  First coil lead conductors 16a and 16b formed by plating or printing a conductive material such as silver on both ends of the first, second, and third coil conductors 13, 14, and 15, respectively. One end of 17a, 17b and the third coil lead conductors 18a, 18b are connected, and the other end is drawn to a position facing the multilayer body 11.

  When each coil lead conductor intersects with another coil lead conductor or each coil conductor, a connection via 19 is provided as in the second coil lead conductor 17b in FIG. It is good to provide.

  The other end of each coil lead conductor is connected to external electrodes 23a to 23f formed on the side surface of the multilayer body 11 with a conductive material such as silver, nickel, or tin.

  As shown in FIG. 2, the external electrode 23 is provided on the opposite side surface of the laminate 11, the external electrodes 23 a to 23 c are provided on one side surface, and the external electrodes 23 d to 23 f are provided on the opposite side surface. It has been.

  The first coil conductor 13 is connected to the external electrodes 23a and 23d, the second coil conductor 14 is connected to the external electrodes 23b and 23e, the third coil conductor 15 is connected to the external electrodes 23c and 23f, and the external electrode 23a. When the external electrodes 23d to 23f are viewed from the ˜23c side, the coil conductors formed in a spiral shape are connected such that the winding directions are the same.

  The common mode noise filter of the present embodiment configured as described above can increase the magnetic coupling in a balanced manner between the coil conductors and increase the impedance of the common mode component. It is possible to improve the removal characteristics.

  In the present embodiment, the first, second, and third coil conductors 13, 14, and 15 are divided and formed on two different insulator layers 12. However, the present invention is not limited to this example. The first, second, and third coil conductors 13, 14, and 15 may be formed on one insulator layer 12 without being divided.

  Such a common mode noise filter will be described with reference to FIG.

  FIG. 3 is an exploded perspective view of another common mode noise filter according to an embodiment of the present invention.

  As shown in FIG. 3, similarly to the above-described embodiment, a laminated body 11 in which a plurality of insulator layers 12 are laminated, and first, second, and third coil conductors provided inside the laminated body 11. Three coil conductors 13, 14, and 15, and external electrodes provided in the multilayer body 11 and connected to the coil conductors are provided.

  And the laminated body 11 is comprised by laminating | stacking the several insulator layer 12 of 1st insulator layer-8th insulator layers 12a-12h.

  Of the laminate 11, the first, second and third insulator layers 12a, 12b and 12c and the seventh and eighth insulator layers 12g and 12h are dummy layers for adjusting the dimensions of the laminate 11. .

  The fourth insulator layer 12d is provided with three coil conductors of first, second, and third coil conductors 13, 14, and 15.

  The fifth insulator layer 12e is provided with first, second, and third lead conductors 16b, 17b, and 18b that lead out the inner peripheral end of each coil conductor to the side surface of the multilayer body 11, and a connection via 19.

  The sixth insulator layer 12f is a protective layer for protecting each coil lead conductor.

  Each of the first, second, and third coil conductors is spirally provided in one or more turns, and the outer shape of the surface orthogonal to the winding axis is formed in a rectangular shape having long sides and short sides.

  Each of these coil conductors is provided on the same surface on the fourth insulator layer 12d without being divided, and the longest outermost sides of the first coil conductor 13 and the second coil conductor 14 are opposed to each other, The short sides of the first coil conductor 13 and the second coil conductor 14 and the longest outermost side of the third coil conductor 15 are arranged to face each other.

  In this way, since the three coil conductors are provided on the same surface as in the above-described embodiment, the distance between the coil conductors can be shortened, and the length of the outer shape of each coil conductor can be reduced. Since the sides and the short sides face each other, the divided coil conductors can be adjacent to each other, and the magnetic coupling can be improved between all the divided coil conductors.

  From these results, when each divided coil conductor is connected, the magnetic coupling of the first, second, and third coil conductors 13, 14, and 15 can be further improved, and the balance of the magnetic coupling can be improved. Can be better.

  The common mode noise filter according to the present invention can improve the removal characteristics of common mode noise, and is useful as a noise countermeasure for mobile phones and information devices.

DESCRIPTION OF SYMBOLS 11 Laminated body 12 Insulator layer 12a-12i 1st insulator layer-8th insulator layer 13 1st coil conductor 13a, 13b 1st division | segmentation coil conductor 14 2nd coil conductor 14a, 14b 2nd division | segmentation coil conductor 15 3rd Coil conductors 15a and 15b Third split coil conductors 16a and 16b First coil lead conductors 17a and 17b Second coil lead conductors 18a and 18b Third coil lead conductors 19 Connection vias 20 First coil connection conductors 21 Second coil connection conductors 22 Third coil connection conductor 23a-23f External electrode

Claims (2)

A laminated body in which a plurality of insulator layers are laminated, three coil conductors provided in the laminated body, and an external electrode provided in the laminated body and connected to the coil conductor, Each of the coil conductors is spiral and is provided in one or more turns, and the outer shape of the surface orthogonal to the winding axis is formed in a rectangular shape having long and short sides with the same dimensions , and one insulator layer Furthermore, when the ratio of the length of the long side to the short side is X, 2.0 <X ≦ 2.5, and two of the three coil conductors A common mode noise filter, wherein the long sides of the coil conductors are opposed to each other, and the short sides of the two coil conductors are opposed to the long sides of the other coil conductors. Each of the three coil conductors is provided by connecting two divided coil conductors, and each of the divided coil conductors is provided in one or more turns in a spiral shape, and the outer shape of the surface orthogonal to the winding axis is provided. It is formed in a rectangular shape having a long side and a short side having the same dimensions, and further, when the ratio of the length of the long side to the short side is X, 2.0 <X ≦ 2.5, Among each of the divided coil conductors, one of the divided coil conductors is provided on one insulator layer, and among the three divided coil conductors, the long sides of the two divided coil conductors are opposed to each other, The short sides of the two divided coil conductors are opposed to the long sides of the other divided coil conductors, and the other divided coil conductor of the divided coil conductors is separated from another insulating layer. Provided on In addition, among the three divided coil conductors, the long sides of the two divided coil conductors are opposed to each other, and the short sides of the two divided coil conductors are opposed to the long sides of the other divided coil conductors. The common mode noise filter according to claim 1, wherein the divided coil conductors connected in the laminating direction of the insulator layers are arranged at positions where they do not overlap each other.

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